AI mistargets Fist of Briggadon gear power

Feel free not to fix this...

Location: Frost Ring Arena
Fight: Nelebrin Scout
Conditions: Nelebrin Scout must be using Briggadon's Chestplate gear
Description:
When the AI activates the gear effect by gaining each Briggadon always targets itself with the Invincible effect instead of one of their other troops (as they used to).